CN109630059A - Pit shaft plug shielding system and method - Google Patents

Abstract

It discloses a kind of for plug to be arranged with the pit shaft plug shielding system and method for the fracture zone in level of isolation, vertical or slanted well bore.The system/method includes the wellbore casing for laterally piercing hydrocarbon containing formation, the pit shaft setting tool (WST) set to the throttle sleeve component (RSM) of large diameter (ID) and throttling plug member (RPE).WST is located at desired shaft location together with RSM.After WST is set and sealed to RSM, is formed in RSM and meet seating surface (CSS).CSS is shaped to the RPE that engagement/reception is arranged in wellbore casing.Engage/dispose RPE isolation RSM with to toe to be in fluid communication to create fracture zone.In the case where not needing milling process, RPE is removed or left before starting well production.Stream during the RSM of big ID reduces Petroleum Production is shunk.

Description

Pit shaft plug shielding system and method

The application is divisional application, and it is 2015 that original bill application, which is application No. is PCT/US2015/031841, the applying date, The PCT application on May 20 and entered National Phase in China, application No. is 201580043314.2, name on 2 13rd, 2017 Referred to as " pit shaft plug shielding system and method ".

Cross-reference to related applications

This application claims inventor Philip M.Snider, Kevin R.George, John T.Hardesty, Michael D.Wroblicky, Nathan G.Clark, James A.Rollins and David S.Wesson, in 2014 8 " the pit shaft plug isolation of U.S. Patent Application No. 14/459,042 being submitted to USPTO, that case number is AGEOD.0120 in months 13 days The equity of system and method " and by reference be incorporated into herein.

The partial exemption of copyright

The all material of present patent application is by the U.S. and the copyright protection of other countries' Copyright Law.For the first time from the application From live application day, which is protected as the material that do not deliver.

However, when patent document or patent disclosure content appears in the patent file or record of U.S.Patent & Trademark Office When, allowing to replicate in the degree that copyright owner does not oppose any facsimile reproduction of patent document or patent disclosure content should Otherwise material will retain the copyrighted right of institute without exception.

Statement about the research or development by federal funding

It is not applicable

Reference to microfiche appendix

It is not applicable

Technical field

This patent disclosure relates generally to the extractions of oil and natural gas.Specifically, the present invention is attempted by selecting restricting element Selecting property is located in wellbore casing and fracture zone is isolated.

The prior art and background of invention

Prior art background

The process of oil and natural gas is extracted usually by including that preparation, drilling well, complete well, production and the operation of abandoned well form.

Prepare drilling well field involve ensuring that its can correctly be approached and the region of drilling machine to be placed and other equipment Through being suitably classified.Must build and safeguard drilling platforms and road, including in fluid-tight lining cutting stone against The influence of any spilling and any rainwater is still allowed suitably to be discharged.

In the drilling well of oil and natural gas well, pit shaft is formed using drill bit, the drill bit is pushed downwards in the lower end of drill string Into.After drilling well, pit shaft is lined with casing string.Therefore, annular region is formed between casing string and pit shaft.Then well cementation behaviour is carried out Make, to fill annular region with cement.The combination of cement and casing strengthens pit shaft, and convenient for the subsequent stratum of casing Some regions be isolated to produce hydrocarbon.

The first step of complete well is to establish connection between final casing and the rock for storing oil and natural gas.There are each Kind operation, it may be necessary to the specific region in well is isolated in these operations.This is usually by one or more set points Place blocks casing temporarily with plug to complete.

The special tool(s) of referred to as perforating gun is lowered to lithosphere.Then emit the perforating gun, create across casing and water Mud and the hole for entering target rock.The rock and pit shaft of these perforations connection storage oil and natural gas.

Since these perforations only have several inches long and are more than that a mile executes in underground, cannot be examined in earth's surface Measure any activity.Then next step is being carried out --- before hydraulic fracturing, remove the perforating gun.Excitation fluid (be more than 90% water and the mixture of sand) plus some chemical addition agents be pumped under controlled conditions deeper subsurface storage stratum In.These chemical substances are for lubricating, preventing from forming bacterium and carry sand.These chemical substances are usually harmless, volume Concentration is 0.1% to 0.5%, and is to aid in required for the performance and efficiency for improving hydraulic fracturing.The excitation fluid passes through It is pumped out by the perforation that perforating gun is formed with high pressure.The process generates crack in the shale containing oil and natural gas.

In many cases, single pit shaft can be through the multiple hydrocarbon containing formations being isolated from each other originally in earth interior.Also Often expectation is being handled these stratum using pressurized treatments fluid before the production of these hydrocarbon containing formations.In order to ensure right Desired stratum carries out processing appropriate, and the stratum is during processing usually and by other perforative formation isolations of pit shaft. In order to realize the sequential processes to multiple stratum, the casing adjacent with the toe of horizontal, vertical or inclined pit shaft first by Perforation, and the non-perforating of other parts for being left the casing.Then by via perforation by the fluid pump incidence bore region of compression In and the region is handled.Plug is placed as after processing adjacent with perforated zone.Repeat the process until all Region all perforatings.The perforation in a part of well is such as set to be isolated or make well with the perforation in another part for completion For the operation that bottom is isolated etc with well head, plug is particularly useful.The purpose of plug is to make certain a part of well and well Another part isolation.

Then, the plug that removal sequence is set from well is needed from these regional production hydrocarbon.In order to rebuild by existing plug Flowing, operator must be removed and/or be destroyed the plug by milling, drilling or soluble washer.

The summary (0100) of prior art systems

As substantially seen in the system diagram of Fig. 1 (0100), the prior art associated with oil and natural gas extraction System may include the wellbore casing (0120) of laterally drilling pit shaft.Multiple pressure break plugs (0110,0111,0112,0113) can be with It is set so that multiple hydraulic fracturing regions (0101,0102,0103) is isolated.Each pressure break plug is positioned as making hydraulic fracturing region It is isolated with other non-perforated zones.The position of pressure break plug can be limited by the default sleeve in wellbore casing.For example, pressure break plug (0111) it is positioned so as to hydraulic fracturing region (0101) and downstream (injection or toe-end) hydraulic fracturing region (0102,0103) Isolation.Then, perforation is carried out to hydraulic fracturing region (0101) using perforating gun and carries out pressure break.Default plug in casing/ Sleeve portion prevents the change in location of the fracture zone after wellbore casing is installed.Therefore, it is necessary to not depend on and pit shaft In the case that the sleeve portion of casing one limited in advance carrys out limit plug, plug is located in expectation after wellbore casing has been installed At position.

In addition, the sleeve for setting fracture plug can have lesser internal diameter after complete well, limitation well production starts When fluid flowing.Therefore, the sleeve that larger interior diameter is needed after complete well allows unrestricted well production fluid to flow.

Moreover, pressure break plug may be set unintentionally at undesirable position in wellbore casing, do not wished to generate The contraction of prestige.The contraction may lock the wellbore tool run to further operate and lead to undesirable shifting Except process.Therefore, it is necessary to prevent the case where setting too early as caused by conventional pressure break plug.

The summary (0200) of art methods

As substantially seen in the method for Fig. 2 (0200), the prior art associated with the extraction of oil and natural gas Including preparing place and installation wellbore casing (0120) (0201).Default sleeve can be used as the integrated portion of wellbore casing (0120) Divide installation to be positioned for the pressure break plug of isolation.In in step (0202) setting fracture plug and isolation hydraulic fracturing region it Afterwards, perforating gun is located in area of isolation in step (0203).Then, perforating gun is triggered and to wellbore casing and cement It carries out perforation and enters hydrocarbon containing formation.Perforating gun then moves to adjacent position, to carry out perforation next time, until hydraulic fracturing region Until whole perforatings.In step (0204), hydraulic fracture fluids are pumped into perforation under high pressure.Repeat include Setting plug (0202), carries out perforation (0203) to hydraulic fracturing region and pumps hydraulic fracture fluids at isolation hydraulic fracturing region The step of being sent in perforation (0204), until all hydraulic fracturing regions in wellbore casing are all processed.In step (0205) in, if all hydraulic fracturing regions are all processed, plug is milled away using milling tool and by the broken of generation Piece pump out wellbore casing or from wherein remove (0206).In step (0207), by being pumped out from hydraulic fracturing section To produce hydrocarbon.

Step (0206) needs removal/milling device to be moved in well on transmission line (conveyance string), institute It states transmission line usually and can be cable, flexible conduit or conjugation tube.The step that sets of perforating process and plug shows as utilizing institute Need individual " stroke " of equipment disengaging pit shaft.Each run is all time-consuming and expensive.In addition, the process of drilling and milling produces Need the fragment removed in another operation.Therefore, it is necessary to multiple hydraulic fracturing areas are isolated in the case where being not necessarily to milling machine operation Domain.Furthermore, it is necessary to position the orifice plug that can be removed in a manner of feasible, economic and timesaving before the production of natural gas Element.

The defect of the prior art

The prior art described in detail above has the disadvantage that

The system of the prior art, which does not provide, determines not depending on the sleeve position of wellbore casing one limited in advance In the case where the plug of position, ball seat is navigated into desired locations after wellbore casing has been installed.

The system of the prior art does not provide, and multiple hydraulic fracturing regions are isolated in the case where not needing milling machine operation.

The system of the prior art does not provide the throttling member that positioning can be removed in a manner of feasible, economic and timesaving Part.

The system of the prior art does not provide the sleeve for setting larger interior diameter to realize unrestricted well production fluid flowing.

The system of the prior art leads to the undesirable too early preset condition for interfering further wellbore operations.

Although more in the prior art may teach for several some solutions in these problems, The prior art does not solve the key problem that hydraulic fracture zone is isolated in the case where not needing milling machine operation.

The purpose of the present invention

Therefore, the purpose of the present invention (among other things) is to evade defect in the prior art and realize following mesh :

There is provided do not depend on carry out limit plug with the sleeve position of wellbore casing one limited in advance in the case where, in well Ball seat is navigated to desired locations after having installed by cylinder casing.

Multiple hydraulic fracturing regions are isolated in the case where not needing milling machine operation for offer.

The restricting element that positioning can be removed in a manner of feasible, economic and timesaving is provided.

The sleeve for setting larger interior diameter is provided to realize unrestricted well production fluid flowing.

The undesirable too early preset condition eliminated and interfere further wellbore operations is provided.

Although the introduction that these purposes should not be construed as limiting the invention, generally, these purposes pass through following Partially the disclosed invention and a part or whole part of discussion are realized.Those skilled in the art can undoubtedly select sheet as disclosed The aspect of invention is to realize any combination of above-mentioned purpose.

Summary of the invention

Systematic review

The present invention solves one or more in object above as follows in embodiments.The present invention provides The system that fracture zone horizontal, in vertical or slanted well bore is isolated in the case where not needing milling machine operation.Institute The system of stating includes laterally piercing the wellbore casing of hydrocarbon containing formation, setting to the throttle sleeve component (RSM) of large diameter (ID) Setting tool and throttling plug member (RPE).The setting tool being arranged on cable or flexible conduit in wellbore casing RSM is set and sealed in desired shaft location.Setting tool is formed in RSM meets seating surface (CSS).CSS is shaped to Engagement/reception is arranged to the RPE in wellbore casing.Engage/dispose RPE isolation RSM toe to with to fluid connect Pass to creation fracture zone.In the case where not needing milling machine operation, RPE is removed or pumps out or leaves.Big ID's Stream during RSM reduces Petroleum Production is shunk.

Method survey

System of the invention can use under the background of entire natural gas abstracting method, wherein pit shaft plug above-mentioned is isolated System is controlled by the method having follow steps:

(1) wellbore casing is installed；

(2) WST is arranged into the expectation shaft location in wellbore casing together with RSM and perforating gun string component (GSA)；

(3) RSM is set at desired shaft location using WST and forms sealing；

(4) perforation is carried out to hydrocarbon containing formation using perforation GSA；

(5) WST and perforation GSA is removed from wellbore casing；

(6) RPE is arranged into the wellbore casing to be placed in RSM and create hydraulic fracturing section；

(7) pressure break is carried out to the section using fracturing fluid；

(8) check whether all hydraulic fracturing sections in the wellbore casing have all been completed, if it is not, then continuing It carries out step (2)；

(9) fluid along production mode reform is allowed to flow；And

(10) since hydraulic fracturing section oil and natural gas production.

The method of this and other preferred illustrative embodiments is together with various preferred illustrative embodiments described herein The set of system both fall within entire scope of the invention.

Detailed description of the invention

In order to be more fully understood by advantage provided by the invention, features as discussed above should refer to, in the accompanying drawings:

Fig. 1 illustrates the systems of the description prior art how the system outline frame in hydraulic fracturing region to be isolated using plug Figure.

How the system that Fig. 2 illustrates the description prior art extracts the flow chart of natural gas from hydrocarbon containing formation.

Fig. 3 illustrates throttling plug member/throttle sleeve component that describe an existing preferred embodiment of the invention, spherical General survey exemplary system side view.

Fig. 3 a illustrates throttling plug member/throttle sleeve structure that describe an existing preferred embodiment of the invention, spherical The exemplary system side view of the general survey of part.

Fig. 4 illustrates throttling plug member/throttle sleeve component that describe a preferred illustrative system embodiment, spherical Side isometric view.

Fig. 5 illustrates general survey that describe multiple sections of a preferred embodiment of the present invention, example well cartridge system.

Fig. 6 illustrates used in some preferred illustrative embodiments of the invention, the isolation of preferred illustrative pit shaft plug The detail flowchart of method.

Fig. 7 illustrates cylindricality section describing a preferred illustrative system embodiment, being placed in throttle sleeve component Flow the side view of plug member.

Fig. 8 illustrates cylindricality section describing a preferred illustrative system embodiment, being placed in throttle sleeve component Flow the side isometric view of plug member.

Fig. 9 illustrates boomerang shape section describing a preferred illustrative system embodiment, being placed in throttle sleeve component Flow the side view of plug member.

Figure 10 illustrates boomerang shape section describing a preferred illustrative system embodiment, being placed in throttle sleeve component Flow the side isometric view of plug member.

Figure 10 a illustrates the side isometric view of boomerang shape throttling plug member that is describing a preferred illustrative system embodiment.

Figure 10 b illustrates another perspective view of boomerang shape throttling plug member that is describing a preferred illustrative system embodiment.

Figure 11 illustrates throttle sleeve structure describing a preferred illustrative system embodiment, being sealed with elastomer element The side view of part.

Figure 12 illustrates throat bushing describing a preferred illustrative system embodiment, being sealed with fastening/sealing element The side isometric view of barrel member.

Figure 13, which is illustrated, describes the throttling that a preferred illustrative system embodiment and wellbore casing inner surface seals The side view of the Internal periphery of shroud member.

Figure 14 illustrates pit shaft describing a preferred illustrative system embodiment, being set to throttle sleeve component The enlarged drawing of setting tool.

Figure 15 illustrate describe preferred illustrative system embodiment, create in throttle sleeve component Internal periphery and The pit shaft setting tool of outer profile.

Figure 16, which is illustrated, describes a preferred illustrative system embodiment, the creation Internal periphery in throttle sleeve component The detailed cross-sectional view of pit shaft setting tool.

Figure 17 illustrate describe preferred illustrative system embodiment, create in throttle sleeve component Internal periphery and The detailed cross-sectional view of the pit shaft setting tool of outer profile.

Figure 18 illustrates pit shaft describing a preferred illustrative system embodiment, being set to throttle sleeve component The viewgraph of cross-section of setting tool.

Figure 19 illustrates pit shaft describing a preferred illustrative system embodiment, being set to throttle sleeve component The detailed cross-sectional view of setting tool.

Figure 20 illustrates pit shaft describing a preferred illustrative system embodiment, being set to throttle sleeve component The auspicious figure of the side cross-sectional of setting tool.

Figure 21 illustrates pit shaft describing a preferred illustrative system embodiment, being set to throttle sleeve component The detail perspective view of setting tool.

Figure 22 illustrates pit shaft describing a preferred illustrative system embodiment, being set to throttle sleeve component Another detail perspective view of setting tool.

Figure 23 illustrates pit shaft describing a preferred illustrative system embodiment, being set to throttle sleeve component Setting tool and the viewgraph of cross-section for removing the tool.

Figure 24 illustrates pit shaft describing a preferred illustrative system embodiment, being set to throttle sleeve component The detailed cross-sectional view of setting tool.

Figure 25 illustrates one preferred illustrative system embodiment of description, from wellbore casing removal pit shaft setting tool Viewgraph of cross-section.

Figure 26 illustrate describe preferred illustrative system embodiment, be arranged and be placed in throttle sleeve component Spherical throttling plug member viewgraph of cross-section.

Figure 27 illustrates spherical shape describing a preferred illustrative system embodiment, being arranged in throttle sleeve component The detailed cross-sectional view of throttling plug member.

Figure 28 illustrates spherical shape describing a preferred illustrative system embodiment, being placed in throttle sleeve component The detailed cross-sectional view of throttling plug member.

Figure 29 illustrate describe preferred illustrative system embodiment, throttle sleeve component is set and is pacified Set the viewgraph of cross-section of the pit shaft setting tool of the second throttling plug member.

Figure 30 illustrate describe preferred illustrative system embodiment, the second throttle sleeve component is set The detailed cross-sectional view of pit shaft setting tool.

Figure 31 illustrate describe preferred illustrative system embodiment, be placed in the second throttle sleeve component The detailed cross-sectional view of spherical shape throttling plug member.

Figure 32 illustrates throttle sleeve component according to preferred illustrative system embodiment, with flow channel Viewgraph of cross-section.

Figure 33 illustrates throttle sleeve component according to preferred illustrative system embodiment, with flow channel Detailed cross-sectional view.

Figure 34 illustrates throttle sleeve component according to preferred illustrative system embodiment, with flow channel Perspective view.

Figure 35 illustrates the transversal of according to preferred illustrative system embodiment, the dual throttle sleeve component set Face view.

Figure 36 illustrates the transversal of according to preferred illustrative system embodiment, the dual throttle sleeve component set Face detail drawing.

It is three-dimensional that Figure 37 illustrates according to preferred illustrative system embodiment, the dual throttle sleeve component set Figure.

Figure 38 illustrate it is according to preferred illustrative system embodiment, at one, two and three position to section The viewgraph of cross-section for the WST that stream shroud member is set.

Figure 39 illustrates according to preferred illustrative system embodiment, with triple throttle sleeve components set The viewgraph of cross-section of WST.

Figure 40 illustrates the transversal of according to preferred illustrative system embodiment, triple throttle sleeve components set Face detail drawing.

Figure 41 illustrates the detailed of according to preferred illustrative system embodiment, triple throttle sleeve components set Perspective view.

Specific embodiment

Although the present invention allows many various forms of embodiments, the preferred embodiment of the present invention is to understand as follows It is shown in the accompanying drawings and will be described in detail herein, is i.e. the present disclosure example that should be considered as the principle of the present invention, And it is not intended to for wide aspect of the invention to be limited to the embodiment of diagram.

A large amount of innovative teachings of the application will be described referring in particular to currently preferred embodiment, wherein these are innovative Introduction is advantageously applied for the particular problem of pit shaft plug shielding system and method.However, it should be understood that the embodiment is only this Many favorably use examples of innovative teachings in text.In short, the statement done in the specification of the present application is not Any of certain restrictions each invention claimed.In addition, some statements can be applied to some creative features, and It is not applied to other creative features.

Nomenclature

RSM: throttle sleeve component, the cylindrical component at selected shaft location.

RPE: throttling plug member is configured to the element that isolation is connected to barrier fluid.

CSS: meeting seating surface, the seat being formed in RSM.

ICD: casing inner diameter, the internal diameter of wellbore casing.

ICS: internal surface of casing, the inner surface of wellbore casing.

ISD: sleeve diameter, the internal diameter of RSM.

ISS: sleeve interior surface, the inner surface of RSM.

WST: pit shaft setting tool, for setting and sealing the tool of RSM.

GSA: rifle string component, the cascade string for making perforating gun be coupled to each other.

The preferred embodiment block diagram (0300,0400) of system

If Fig. 3 (0300) and Fig. 3 a (0320) are shown generally, the present invention can be seen in more detail, wherein wellbore casing (0304) it is mounted in hydrocarbon containing formation (0302) and is held in place by pit shaft cement (0301).Wellbore casing (0304) can be with With internal surface of casing (ICS) associated with casing inner diameter (ICD) (0308).For example, ICD (0308) can be from 2³/₄Inch To 12 inches.Throttle sleeve component (RSM) (0303) within wellbore casing is arranged by pit shaft setting tool (WST) Wherein, to be sealed in the inner surface of wellbore casing.According to setting for RSM (0303), it is described seal can be leak or Person is close.RSM (0303) can be the hollow pillar member with sleeve interior surface and sleeve outer surface.RSM (0303) can With concentric with wellbore casing and coaxially in the ICS.In a preferred exemplary embodiment, the sealing prevents RSM (0303) is substantially axial along the inner surface of the wellbore casing or longitudinally slides.RSM (0303) can be configured to fit The sleeve diameter (ISD) (0307) fitted in the ICD (0308) of wellbore casing (0304) is associated.It is real in another preferred illustrative It applies in example, the sufficiently large unrestricted fluid motion to allow to pass through during production sleeve interior surface (ISS) of ISD (0307). ISD (0307) and the ratio of ICD (0308) can be from 0.5 to 0.99.For example, ICD can be 4.8 inches, and ISD can be 4.1 inch.In aforementioned exemplary, the ratio of ISD (0307) and ICD (0308) is 0.85.The diameter of ISD (0307) is from pit shaft Can further it become smaller during the production of fluid, to allow the fluid of the almost green diameter of wellbore casing to flow.Another In preferred exemplary embodiment, RSM (0303) can be by containing aluminium, iron, steel, titanium, tungsten, copper, bronze, brass, plastics, compound The material of material, natural fiber and carbide is made.RSM (0303) can be by degradation material or commercially available material system At.

In a preferred embodiment, RSM (0303) is set ICS with compressed mode with the shape on RSM (0303) by WST At Internal periphery.The Internal periphery can form closely or have the sealing of leak, prevent the substantially axial fortune of RSM (0303) It is dynamic.In an additional preferred embodiment, RSM (0303) can be set ICS with expansion mechanism by WST, provide more contact tables Face is for making RSM (0303) be sealed in ICS.It is further described in Figure 15 below and RSM is set by compression and expansion mechanism (0303) more details.

In another preferred illustrative embodiment, WST can be used the fastening that is disposed therein together with RSM (0303)/ Sealing element sets RSM (0303), and the outer surface of RSM (0303) is fastened to ICS.Description passes through pressure in Figure 11 below Contracting and expansion mechanism set the more details (1100) of (0303) RSM.

In a further advantageous embodiment, RSM is set at the position that WST can be any desired in wellbore casing (0304) (0303).It can be selected based on the information of such as preferred hydrocarbon containing formation region, pressure break section and wellbore conditions etc described Desired locations.Desired position can be selected to create non-uniform hydraulic fracturing section.For example, shorter hydraulic fracturing area Section may include single perforating site, so that the position RSM is selected as close to each other to adapt to perforating site.Similarly, longer Hydraulic fracturing section may include multi-openings position so that the position RSM is selected as away from each other to adapt to multi-openings Position.Shorter and longer hydraulic fracturing position can be determined based on the specific information of hydrocarbon containing formation (0302).For pit shaft In position at hydrocarbon information, drill returns log analyzes mud during drilling well.Main drill returns log condition can be monitored, To dynamically change the desired locations of (0303) RSM.

WST creation can meet seating surface (CSS) (0306) in RSM (0303).WST can be by shrinking RSM (0303) manufacturing side (heel end) of the inner diameter zone in (0303) RSM forms inclined edge to create CSS (0306).CSS (0306) inner surface can be formed such that it positions and holds throttling plug member (RPE) (0305).The diameter of RPE (0305) Be chosen so as to its less than RSM (0303) outer diameter and be greater than RSM (0303) internal diameter.CSS (0306) and RPE (0305) can be with It complementally forms, so that RPE (0305) peace is against CSS (0306).For example, RPE (0306) can be spherical, and CSS (0306) it can be inclined plane shape, so that RPE (0305) can be placed in CSS (0306) when applying pressure difference.Applying When pressure difference, i.e., when the pressure of RSM (0303) upstream (production or heel end) is greater than the pressure of RSM (0303) downstream (injection or toe-end) When, RPE (0305) can be with Prssure lock together in CSS (0306).The pressure difference established across RSM (0303) locks RPE (0305) just Position, so that the fluid communication of downstream (injection or toe-end) be isolated.According to a preferred exemplary embodiment, it is placed in CSS (0306) RPE (0305) area of isolation in enables to do not influencing the hydraulic fracturing section in downstream (injection or toe-end) In the case of carry out hydraulic fracturing operations in this region.RPE (0305) can also be configured with other shapes, such as stopper, boomerang shape Or cylindricality.It should be noted that it will be appreciated by those skilled in the art that meeting any other shape of seating face may be used to RPE is to realize and above-mentioned similar isolation effect.

According to another preferred embodiment, RPE (0305) can be directly positioned in the case where not needing (0306) CSS In RSM (0303).In this case, RPE (0305) can be locked to the vertical edge of (0303) RSM, this may be needed Larger-diameter RPE (0305).

According to another preferred exemplary embodiment, RPE (0305) can degrade with the time and in well fluids, thus Eliminate the needs being removed before production.The degradation of RPE (0305) can also pass through hydraulic fracture fluids or wellbore fluids Acid ingredient accelerated, to reduce the diameter of (0305) RPE, so as to flow out before the production phase starts (pumping out) wellbore casing or reflux (pumped back) are to surface.

In another preferred exemplary embodiment, RPE (0305) can be by metal material, nonmetallic materials, carbide Material or any other commercially available material are made.

The Multi sectional system diagram (0500) of preferred embodiment

If Fig. 5 (0500) is shown generally, the present invention can be seen in more detail, be shown according to below in Fig. 6 (0600) method described in, wellbore casing (0504) after hydraulic fracturing is carried out in multiple sections (pressure break section). By by RSM (0511,0512,0513) set at desired position then with throttling plug member RPE (0501,0502, 0503) each section is isolated successively to create multiple sections (0520,0521,0522,0523).RSM can be set by WST (0513), then perforating gun string component (GSA) is located in hydraulic fracturing region (0522) and perforation is carried out to section.With Afterwards, it arranges RPE (0503) and hydraulic fracturing is carried out to section (0522).WST and perforation GSA is removed, it is further to carry out Operation.Hereafter, RSM (0512) is set and is sealed by WST, then carry out perforating application.Another RPE (0502) is arranged To be placed in RSM (0512), to form hydraulic fracturing region (0521).Hereafter, hydraulic fracturing is carried out to section (0521). Similarly, it creates hydraulic fracturing region (0520) and carries out hydraulic fracturing.

According to the one aspect of preferred exemplary embodiment, RSM can be set in desired locations by WST, so that Multiple hydraulic fracturing regions can be created in wellbore casing by obtaining RPE.According to wellbore conditions or the position of hydrocarbon containing formation, waterpower Fracture zone can separate with equidistant separation or unevenly.

According to another preferred exemplary embodiment, due to the pressure difference established across RSM, RPE is locked into position.For example, Due to the positive differential pressure established across RSM (0512), i.e. upstream (hydraulic fracturing section 0520,0521 and towards wellbore casing The section of heel end) pressure be greater than downstream (section of hydraulic fracturing section 0522,0523 and the toe towards wellbore casing) pressure, RPE (0502) is locked in the seat of (0512) RSM.

According to another preferred exemplary embodiment, RPE (0501,0502,0503) can all sections in the wellbore As the time degrades after all completing, is flowed back or flowed into pit shaft by pumping, to eliminate the need to milling machine operation It wants.

According to another preferred exemplary embodiment, RPE can change shape or intensity, make it possible to along production (heel end) or injection (toe-end) direction pass through RSM.For example, RPE (0512) can degrade and change shape, make it possible to RSM (0511) is passed through along production mode reform or passes through RSM (0513) along injection direction.RPE can also be degraded, so that these RPE is between the RSM of current session and previous section, and limiting towards the fluid communication of injection end (toe-end) still allows edge The fluid of production mode reform (heel end) flows.For example, RPE (0502) can degrade, so that its peace comes to and can have flow channel RSM (0511) injection end (toe-end).The flowing in RSM is further described in Figure 32 (3200) and Figure 34 (3400) below Channel.

According to another preferred exemplary embodiment, the internal diameter of RSM (0511,0512,0513) can be it is identical and The sufficiently large unrestricted fluid with permission during well production operation flows.RSM (0511,0512,0513) can be in well stream It further degrades in body, to provide the even greater diameter of diameter compared to wellbore casing (0504), to allow raw in well The fluid of enhancing between term flows.The degradation can be accelerated by the acid in hydraulic fracture fluids.

Preferred exemplary throttling plug member (RPE)

It should be noted that some in the material and design of following RPE are not restricted and should not be construed as limiting.This is basic RPE design and material can be extended with various additional embodiments, including but not limited to:

Be made of multilayer material, wherein in material it is at least one layer of at a temperature of melt or deformation, to allow size Or shape changes.

It can be the solid core of the outer layer with fusible material.

It can have or can not have another outer layer, such as rubber coating.

It can be homogenous material, non-degradable.

Outer layer can have or can not have hole, and internal layer is melted and liquid can release.

Access across it is filled with fusible, degradable or dissolved material.

Using downhole temperature and pressure, change during excitation and subsequent well heat so as to have laminated multi-layer material The shape of the obstacle of material changes.

Use the solid core of degradable or easy erosion.

Use acid-soluble alloying pellet.

Use water-soluble polymer pressure break ball.

Use polyglycolic acid ball.

Preferred example well tube plug isolation flow chart embodiment (0600)

As substantially seen in the flow chart of (0600) Fig. 6, a kind of preferred example well tube plug partition method can be with Substantially described according to following steps:

(1) wellbore casing (0601) is installed；

(2) WST is arranged into the expectation shaft location in wellbore casing together with RSM and perforating gun string component (GSA)； WST can arrange (0602) by the perforation (TCP) that cable, flexible conduit or pipe transmit；The perforation GSA may include Multi-openings rifle；

(3) RSM is set at desired shaft location using WST；WST can be sat using electric load or pressure It seals RSM (0603)；The electric load generates pressure in the setting tool for setting RSM；RSM can have or can not have Have and meets seating surface (CSS)；CSS can be formed in desired shaft location by machining or by WST；

(4) perforation is carried out to hydrocarbon containing formation using perforation GSA；Perforation GSA once can carry out perforation to a section, so GSA is pulled afterwards and perforation is carried out to next section in section；Perforating application continues all in section until completing Section；

(5) WST and perforation GSA are removed from wellbore casing；WST can be moved by cable, flexible conduit or TCP Except (0605)；

(6) RPE is arranged as being placed in RSM, the downstream (toe-end of upstream (heel end or the manufacturing side) and RSM of RSM is isolated Or injection end) between fluid communication and generate hydraulic fracturing section；RPE can be pumped from surface, by gravity arrangement or Person is set by tool；If there are CSS, RPE to be placed in CSS in RSM；The complementary shape of RPE and CSS makes RPE can be arranged in CSS；Positive differential pressure can enable to driving RPE and lock it in CSS (0606)；

(7) by be pumped by hydraulic fracture fluids to Make Path in hydrocarbon containing formation, to hydraulic fracturing section into Row pressure break (0607)；

(8) check whether all hydraulic fracturing sections in wellbore casing have all been completed, if it is not, then continuing Step (0602)；Prepare WST being arranged into different shaft locations towards the heel end of pressure break section；Hydraulic fracturing section can be with It is determined by the length for the casing being mounted in hydrocarbon containing formation；If all sections have all carried out pressure break, continue Step (0609), (0608)；

(9) fluid along production (heel end) direction is allowed to flow；When RPE is positioned between RSM, may be implemented by The fluid of the flow channel designed in RSM flows；It can also realize the stream of the flow channel by designing in RPE and RSM Body flowing；Alternatively, RPE can also be removed from wellbore casing or RPE can flows back into surface, be pumped in pit shaft, Either (0609) is degraded there are wellbore fluids or acid；And

(10) since all sections for carrying out hydraulic fracturing oil and natural gas production (0610).

The block diagram side view (0700,0800) of the preferred embodiment of cylindricality orifice plug system

If Fig. 7 (0700) and Fig. 8 (0800) are shown generally, a preferred embodiment can be seen in more detail, Middle cylindricality orifice plug element (0702) is placed in CSS (0704) to provide downstream pressure isolation.Wellbore casing (0701) installation In hydrocarbon containing formation.RSM (0703) can be set in desired locations and be sealed against in shaft sleeve by pit shaft setting tool Manage the inner surface of (0701).As described in the method described in Fig. 6 (0600) of front, WST can in RSM (0703) shape At CSS (0704).According to a preferred exemplary embodiment, cylindricality throttling plug member (RPE) (0702) can be arranged to To be placed in CSS (0704) in wellbore casing.

The diameter of RPE (0702) is chosen so as to it less than the outer diameter of RSM (0703) and is greater than the interior of RSM (0703) Diameter.CSS (0704) and RPE (0702) can be formed complementally, so that RPE (0702) peace is against CSS (0704).For example, RPE It (0702) can be cylindrical, and CSS (0704) can be inclined plane shape, so that when applying pressure difference, RPE (0702) placement In CSS (0704).When applying pressure difference, RPE (0702) can be with Prssure lock together in CSS (0704).

It is not formed by WST in RSM (0703) there is no CSS or CSS if should be noted that, cylindricality RPE (0702) edge for coming to (0703) RSM can directly be pacified.

The block diagram side view (0900-1020) of the preferred embodiment of boomerang shape orifice plug system

It, can be more detailed if Fig. 9 (0900), Figure 10 (1000), Figure 10 a (1010) and Figure 10 b (1020) are shown generally Another preferred embodiment is seen on ground, and wherein boomerang shape throttling plug member (0902) is placed in CSS (0904) to provide pressure isolation. According to above in Fig. 7 described in similar procedure, RPE (0902) is for being isolated and create fracture zone, to allow in the pressure Perforation and hydraulic fracturing operations are carried out in split plot domain.Such as the perspective view of the boomerang shape RPE in Figure 10 a (1010) and Figure 10 b (1020) Shown, boomerang shape RPE is complementally formed to be arranged in RSM.Boomerang shape RPE (0902) is designed such as the fingers of (0902) RPE It is compressed during production, to allow the fluid along production mode reform to flow.

The block diagram (1100,1200) of the side cross-sectional view of the preferred embodiment of throttle sleeve construction system

If Figure 11 (1100) and Figure 12 (1200) are shown generally, a preferred embodiment can be seen in more detail, Multiple fastening/sealing elements (1103) are wherein utilized, throttle sleeve component RSM (1104) is sealed in wellbore casing (1101) Inner surface.Tightening member can be elastomer, carbide button or wicker plaiting article form.After installing wellbore casing (1101), pit shaft is sat Envelope tool can be arranged into desired shaft location with RSM (1104) together.Then WST can compress RSM (1104) in the phase Hope position is on the inner surface of (1104) RSM to form multiple Internal peripheries (1105).In a preferred exemplary embodiment, Internal periphery (1105) can be formed before being arranged into desired shaft location.Compression stress component in Internal periphery (1104) can To help for RSM (1104) to be sealed in the inner surface of wellbore casing (1101).Multiple fastening/sealing elements (1103) can be used for Sealing element (1106) further are reinforced, to prevent the substantially axial or longitudinal movement of RSM (1104).Tightening member (1103) can To be that can be fixedly secured to the inner surface of wellbore casing (1101) in the form of elastomer, carbide button or wicker plaiting article.Sealing It (1106) can be by multiple Internal peripheries (1104), multiple tightening members (1103) or Internal periphery (1104) and tightening member (1103) combination is formed.Then, as described in through the preceding method in Fig. 6 (0600), WST can form CSS (1106) And RPE (1102) is disposed to create downstream isolation (toe-end).

The block diagram of the side cross-sectional view of the preferred embodiment of the Internal periphery and outer profile of throttle sleeve construction system (1300-1700)

If Figure 13 (1300) is shown generally, another preferred embodiment can be seen in more detail, wherein throttle sleeve Component RSM (1304) is sealed in the inner surface of wellbore casing (1301).After wellbore casing (1301) are installed, pit shaft setting tool Desired shaft location can be arranged into together with RSM (1304).Then WST can compress RSM (1304) in desired position It sets and forms multiple Internal peripheries (1305) on the inner surface for being in (1304) RSM and formed on the outer surface of (1304) RSM more A outer profile (1303).In a preferred exemplary embodiment, it can be formed before being arranged into desired shaft location Internal periphery (1305) and outer profile (1303).Compression stress component in Internal periphery (1304) and outer profile (1303) can help RSM (1304) is sealed in the inner surface of wellbore casing (1301).Outer profile (1303) can be at multiple points of prominent profile The inner surface of wellbore casing is contacted, directly to provide sealing (1306) and prevent the axial or longitudinal movement of RSM (1304).

Similarly, Figure 15 (1500) is illustrated to be sealed in the inner surface of wellbore casing and is created in throttle sleeve component Build the cable setting tool of Internal periphery and outer profile.Figure 16, which is illustrated, forms Internal periphery (1604) in RSM (1602) to be formed To the detailed cross-sectional view of the WST (1603) of the sealing (1605) of the inner surface of wellbore casing (1601).Similarly, (1700) Figure 17 It illustrates and forms Internal periphery (1704) and outer profile (1706) in RSM (1702) to form the inner surface of wellbore casing (1701) Sealing (1705) WST (1703) detailed cross-sectional view.Internal periphery according to a preferred exemplary embodiment, in RSM Form the sealing to the inner surface of wellbore casing with outer profile, prevent axial direction of the RSM during perforation and hydraulic fracturing process and Longitudinal movement.

The block diagram (1800-2200) of the preferred embodiment of pit shaft setting tool (WST) system

Figure 18 (1800) and Figure 19 (1900) show the elevational cross-section view of WST.It is preferred exemplary according to one Embodiment, it is such as shown generally in Figure 20 (2000), pit shaft setting tool (WST) can be seen in more detail.WST-RSM set RSM (2008) is held in place by cylinder adapter (2001), until it reaches desired down well placement.The phase is in RSM (2008) When hoping position, WST-RSM sleeve adapter (2001) helps that reaction force is made to engage RSM (2008).When WST (2002) is caused When dynamic, RSM forges and presses component and obturating plug (2005) provides axial force to forge and press expansion sleeve (2004) outward.RSM-ICD expansion Sleeve (2004) outside banding, to create sealing surfaces between RSM (2008) and casing inner diameter (ICD) (2009).In WST (2002) after the completion of actuating, sealing force and other tractive force adding sets (such as carbide button or wicker plaiting article can be passed through Form) it is potential using and RSM (2008) is remained into ICD (2009).By means of can be machining ring or shearing pin-shaped Actuating power is transmitted to RSM (2008) from WST (2002) by the shear sleeve group of formula, WST-RSM piston (2006).In the setting process phase Between, connecting rod (2003) keeps together entire component.In activating, connecting rod (2003) can be by setting force from WST (2002) WST piston (2006) are passed to.Figure 21 (2100) and Figure 22 (2200) illustrates in greater detail the solid of (2002) WST Figure.

The block diagram (2300-3100) of the preferred embodiment of pit shaft plug shielding system

As substantially found out in the flow chart of earlier figures 6 (0600), illustrated in Figure 23 (2300)-Figure 31 (3100) The execution step of pit shaft plug isolation.

As described in above step (0601), (0602) and (0603), Figure 23 (2300) is shown throttle sleeve Component (2303) sets the pit shaft setting tool (WST) (2301) on the inner surface of wellbore casing (2302).WST (2301) can It can be machined in advance with meeting seating surface (CSS) or CSS in the middle creation of RSM (2303).Cable can be used (2304) or WST (2301) is pumped into the desired locations in wellbore casing (2302) by TCP.Figure 24 (2400) show by RSM (2303) sets the detail drawing in desired locations.

Figure 25 (2500) illustrate as before described in step (0604) and (0605), set RSM (2303) and Remove the section that WST (2301) utilize perforating gun perforation later.

Figure 26 (2600) is illustrated as described in step (0606), the throttling plug member that is arranged into wellbore casing (RPE)(2601).RPE (2601) can be placed in meeting in seating surface in RSM (2303), or if there is no CSS If be then directly positioned in RSM.After having disposed RPE (2601), the section is isolated with toe-end pressure communication.Such as in step Suddenly described in (0607), hydraulic fracturing is carried out to the section being isolated.Figure 27 (2700), which is shown, to be arranged into wellbore casing RPE (2601) details.Figure 28 (2800) shows the details for the RPE (2601) being placed in RSM (2303).

Figure 29 (2900), which is illustrated, sets another RSM (2903) in another desired locations towards RSM (2303) heel The WST (2301) at place.Another RPE (2901) is arranged to be placed in RSM (2903).RPE (2901) isolation towards it is aforementioned by Another section of the toe of section is isolated.Pressure break is carried out by isolation section to described using hydraulic fracture fluids.Figure 30 (3000) Show detailed cross-sectional view RSM (2903) set in the WST (2301) of desired locations.Figure 31 (3100) shows placement The detailed cross-sectional view of RPE (2901) in RSM (2903).When completing such as whole sections described in (0608), RPE can To be maintained between RSM or flow back or be pumped in pit shaft (0609).According to a preferred exemplary embodiment, RPE Be with RSM it is degradable, this allow larger interior diameter with there is no limit and hinder in the case where effectively pump petroleum and natural Gas.

The block diagram (3200-3400) of the preferred embodiment of throttle sleeve component (RSM) with flow channel

It is such as shown generally in Figure 32 (3200), Figure 33 (3300) and Figure 34 (3400), it can see in more detail another One preferred embodiment is set including the throttle sleeve component (RSM) of flow channel (3301) in wellbore casing (3305) in.It can be formed in RSM (3306) and meet seating surface (CSS) (3303).Design has flowing in RSM (3306) Channel (3301), to allow the fluid during oil and natural gas produces to flow.The step of before such as in figure (0600) (0609) after whole sections all carry out hydraulic fracturing as described in, throttling plug member (RPE) degradation is not moved still Except when, flow channel provide along production mode reform fluid path.Channel (3301) is designed such as blocking in RPE along injection direction There is the unrestricted fluid flowing along production mode reform (with to) when the fluid communication of (toe to).RPE is stayed in original place to provide Obvious advantage relative to the prior art for needing milling machine operation to mill away the pressure break plug for being arranged as that section is isolated.

According to another preferred embodiment, if necessary, RSM can be designed as above having finger-shaped material at either end, In order to milling machine operation.Toe-end finger-shaped material (3302) and heel end finger-shaped material (3304) can separately design the toe in (3306) RSM On end and heel end.Under the background of milling machine operation to, toe-end finger-shaped material can be pushed to the heel end finger-like of next RSM (toe to) Object, the interlocking so that finger-shaped material interweaves.Then, compared with the current method of each RSM of milling respectively, all RSM can be mutually Lock, is finally milled away in one operation.

Double groups of block diagrams (3500-3700) of the preferred embodiment of pit shaft setting tool (WST) system

Such as shown generally in Figure 35 (3500), Figure 36 (3600) and Figure 37 (3700), pit shaft setting tool is by throat bushing The two sides of barrel member (RSM) (3601) set or are sealed to the inner surface (3604) of wellbore casing.In this context, WST exists Forge and press and set to RSM the inner surface of wellbore casing on two sides (two groups).On one end of (3601) RSM, RSM-ICD expansion sleeve in WST can outside banding, to be created between RSM (3601) and casing inner diameter (ICS) (3604) Sealing surfaces.On the other side of (3601) RSM, after the completion of the actuating of WST, WST can be led by means of sealing force with other RSM (3601) are protected in the potential use for drawing addition clamp device (3603) (such as elastomer, carbide button or wicker plaiting article form) Hold ICS (3604).

According to a preferred exemplary embodiment, double group selections are provided, wherein one end of RSM is sealed directly to by WST The inner surface of wellbore casing is simultaneously using the tightening member sealing other end to prevent from axially and longitudinally moving.

The multiple groups block diagram (3800-4100) of the preferred embodiment of pit shaft setting tool (WST) system

Such as shown generally in Figure 38 (3800), Figure 39 (3900), Figure 40 (4000) and Figure 41 (4100), pit shaft is set Tool sets or seals RSM at multiple positions.Figure 38 (3800), which is shown, (single group) can set or seal at single location The WST (3810) of RSM, can at two positions (double groups) set or seal RSM WST (3820) or can be three positions Place's of setting (three groups) sets or seals the WST (3830) of RSM.It can see the more detailed of WST (3830) in Figure 40 (4000) Diagram.WST (3830) sets RSM (4004) at three positions (4001), (4002) and (4003).According to a preferable example Property embodiment, WST sets or seals RSM at multiple positions, to prevent the substantially axial or longitudinal movement of RSM.It should be noted that , single group, double groups and three groups show and should not be construed so as limit only for illustration purpose.WST can be sat at multiple positions Envelope or sealing RSM and be not limited to single group above-mentioned, double groups or three groups.It can be seen that three groups of equidistant view in Figure 41 (4100) Figure.

The preferred embodiment of the polishing tie-back sleeve (PBR) of throttle sleeve component

According to a preferred exemplary embodiment, throttle sleeve component can also be configured to or without CSS. The sleeve interior surface (ISS) of RSM can be formed by polishing tie-back sleeve (PBR).But it is different from the RPE under being independently pumped, Sealing device can be arranged in a part on cable or as tubing string.Then sealing device can be utilized in sleeve interior surface (ISS) rather than the sealing element in the limiting diameter on the surface ICS is sealed.The surface PBR in ISS, which provides, it is expected The obvious advantage of selectivity sealing RSM between sealing station at shaft location to be handled or be reprocessed operation, well life Produce test or the test of casing globality.

Systematic review

System of the invention is it is contemplated that various modifications under extracting the basic theme of natural gas using wellbore casing, Er Qieneng It is enough summarised as a kind of well bore isolation plug system, the system comprises:

(a) throttle sleeve component (RSM)；With

(b) plug member (RPE) is throttled；

Wherein

The RSM is configured to fit in wellbore casing；

The RSM is configured to be located at desired shaft location by pit shaft setting tool (WST)；

The WST is configured to sealing element be set and is formed in RSM and the wellbore casing for the throttle sleeve component Inner surface between, to prevent the big movement of RSM；With

RPE is configured to positioning to be placed in RSM；

The general system can be extended by each element described herein to generate and be consistent with whole design description Many inventive embodiments.

Method survey

Method of the invention can be summarised as a kind of pit shaft plug it is contemplated that various modifications under the basic theme executed Partition method, wherein executed in well bore isolation plug system the described method includes:

(a) throttle sleeve component (RSM)；With

(b) plug member (RPE) is throttled；

Wherein,

The RSM is configured to fit in wellbore casing；

The RSM is configured to be located at desired shaft location by pit shaft setting tool (WST)；

The WST is configured to that sealing element is set and is formed between RSM and the inner surface of the wellbore casing, to prevent The big movement of RSM；With

RPE is configured to positioning to be placed in RSM；

The method comprise the steps that

(1) wellbore casing is installed；

(2) WST is arranged into the expectation shaft location in wellbore casing together with RSM and perforating gun string component (GSA)；

(3) RSM is set at desired shaft location using WST and forms sealing；

(4) perforation is carried out to hydrocarbon containing formation using perforation GSA；

(5) WST and perforation GSA is removed from wellbore casing；

(6) RPE is arranged into the throttle sleeve component, to be placed in RSM and create hydraulic fracturing section；

(7) pressure break is carried out to the section using fracturing fluid；

(8) check whether that all hydraulic fracturing sections in the wellbore casing have all been completed, if it is not, then continuing It carries out step (2)；

(9) fluid along production mode reform is allowed to flow；With

(10) since hydraulic fracturing section oil and natural gas production.

The general method can be extended by each element described herein to generate and be consistent with whole design description Many inventive embodiments.

The modification of system/method

The present invention is it is contemplated that various modifications under the basic theme of the extraction of oil and natural gas.Aforementioned exemplary does not represent can It can whole possible use scopes.They are intended to enumerate some in virtually limitless possibility.

The fundamental system and method can be extended with various additional embodiments comprising but be not limited to:

One embodiment, wherein the WST, which is further configured to be formed in the RSM, meets seating surface (CSS)；With The RPE is configured in a manner of complementary with the CSS shape, to be placed in the CSS.

One embodiment, wherein machining meets seating surface (CSS) in the RSM；With the RPE with it is described The mode of CSS shape complementation configures, to be placed in the CSS.

One embodiment, wherein the WST utilizes the fastening selected from elastomer, carbide button and wicker plaiting article form The RSM is fastened to the inside of described sleeve pipe by element.

One embodiment, wherein the RSM is degradable.

One embodiment, wherein the RPE is degradable.

One embodiment, wherein the material of the RSM is selected from following composed group: aluminium, iron, steel, titanium, tungsten, copper, blueness Copper, brass, plastics and carbide.

One embodiment, wherein the material of the RPE be selected from it is following composed by group: it is metal, nonmetallic and ceramic.

One embodiment, wherein the shape of the RPE is selected from following composed group: spherical, cylindricality and boomerang shape.

One embodiment, wherein

The wellbore casing includes internal surface of casing (ICS) associated with casing inner diameter (ICD)；

Wherein the RSM includes sleeve interior surface (ISS) associated with sleeve diameter (ISD)；With

The ratio of the ISD and ICD is from 0.5 to 0.99.

One embodiment, wherein the multiple RPE is configured to the hydraulic fracturing section that creation unevenly separates.

One embodiment, wherein the RPE is nondegradable.

The RPE is maintained between RSM；With

Allow to flow along production mode reform by the fluid of the fluid channel in RSM.

One embodiment, wherein the RPE is nondegradable；It is configured to pass through institute along production mode reform with the RPE State RSM.

One embodiment, wherein the RSM is set the shaft sleeve at multiple of the RSM by the WST The inner surface of pipe.

One embodiment, wherein the sleeve interior surface of the RSM includes polishing tie-back sleeve (PBR).

It will be appreciated by those skilled in the art that on the combination foundation for the element instructed within above description of the invention its His embodiment is possible.

Conclusion

Disclose it is a kind of for limit plug with the pit shaft plug of the fracture zone in level of isolation, vertical or slanted well bore every From system and method.The system/method includes the wellbore casing for laterally piercing hydrocarbon containing formation, the throttling to large diameter (ID) The pit shaft setting tool and throttling plug member (RPE) that shroud member (RSM) is set.WST is located in together with RSM It is expected that at shaft location.After WST is set and seals RSM, is formed in RSM and meet seating surface (CSS).CSS is shaped to connect Conjunction/reception is arranged to the RPE in wellbore casing.Engagement/placement RPE be isolated RSM toe to with to fluid communication with Create fracture zone.RPE is removed or leaves before starting well production, without milling process.The RSM of big ID reduces Stream during Petroleum Production is shunk.

Claims (10)

1. a kind of pit shaft plug shielding system, comprising:

(a) throttle sleeve component is configured to fit within wellbore casing and is configured as being located in pit shaft by pit shaft setting tool At any desired position in casing, so that the throttle sleeve component is sealed to the inner surface of the wellbore casing；With

(b) throttle plug member, and configuration comes to the throttle sleeve component to be positioned as peace；

Wherein, (i) the throttle sleeve component has flow channel or (ii) described throttle sleeve component and the section wherein Stream plug member has flow channel wherein, for flowing along production mode reform by the production fluid of the flow channel.

2. pit shaft plug shielding system as described in claim 1, wherein the throttle sleeve component, which has, meets seating surface；And And

The orifice plug element configuration is to be placed in described meet in seating surface.

3. pit shaft plug shielding system as described in claim 1, wherein fastening member of the pit shaft setting tool using elastomer The throttle sleeve component is fastened to the inside of described sleeve pipe by part.

4. pit shaft plug shielding system as described in claim 1, wherein the pit shaft setting tool utilizes the fastening of carbide button The throttle sleeve component is fastened to the inside of described sleeve pipe by element.

5. pit shaft plug shielding system as described in claim 1, wherein the pit shaft setting tool utilizes the fastening of wicker plaiting article form The throttle sleeve component is fastened to the inside of described sleeve pipe by element.

6. pit shaft plug shielding system as described in claim 1, wherein the material of the throttle sleeve component includes metal.

7. pit shaft plug shielding system as described in claim 1, wherein the material of the throttle sleeve component includes plastics.

8. pit shaft plug shielding system as described in claim 1, wherein the material of the throttle sleeve component includes fiber.

9. pit shaft plug shielding system as described in claim 1, wherein

The wellbore casing includes the internal surface of casing with casing inner diameter；

The throttle sleeve component includes sleeve diameter；With

The ratio of the sleeve diameter and described sleeve pipe internal diameter is 0.5 to 0.99.

10. a kind of pit shaft plug partition method using pit shaft plug shielding system, wherein the system comprises:

(a) throttle sleeve component is configured to fit within wellbore casing and is configured to be located in shaft sleeve by pit shaft setting tool At any desired position in pipe；With

(b) throttle plug member, and configuration comes to the throttle sleeve component to be positioned as peace；

Wherein, (i) the throttle sleeve component has flow channel or (ii) described throttle sleeve component and the section wherein Stream plug member has flow channel wherein, for flowing along production mode reform by the production fluid of the flow channel；

The method comprise the steps that

(1) wellbore casing is installed；

(2) pit shaft setting tool is arranged into wellbore casing together with the throttle sleeve component and perforating gun string component It is expected that shaft location；

(3) the throttle sleeve component is set at the expectation shaft location with will be described using the pit shaft setting tool Throttle sleeve component is sealed to the inner surface of wellbore casing；

(4) perforation is carried out to hydrocarbon containing formation using the perforating gun string component；

(5) the pit shaft setting tool and the perforating gun string component are removed from the wellbore casing；

(6) the throttling plug member is arranged into the wellbore casing to be placed in the throttle sleeve component, to create Build hydraulic fracturing section；

(7) pressure break is carried out to the section using fracturing fluid；

(8) check whether all hydraulic fracturing sections in the wellbore casing have all been completed, if it is not, then continuing Step (2)；

(9) the direction fluid for allowing to flow along production fluid flows；And

(10) since the hydraulic fracturing section oil and natural gas production.